New Insights into an Old Molecule: Interaction Energies of Theophylline Crystal Forms

Katharina Edkins, Garry J. McIntyre, Clive Wilkinson, Marc Henry, Judith A.K. Howard, Jonathan W. Steed

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


The asthma therapeutic theophylline exists in at least three anhydrous polymorphs and a monohydrate. The single-crystal X-ray structure of the high-temperature polymorph form I is presented for the first time, and the energetic relationship between forms I and II is investigated using the partial charges and chemical hardness analysis (PACHA) algorithm. It is shown that the interactions in the form I crystal network are stronger, especially the hydrogen bond. The single-crystal neutron structure of the monohydrate demonstrates static disorder of the water molecule as well as dynamic disorder of the methyl groups. PACHA investigations based on the neutron coordinates reveal that the homomeric interactions in this form are stronger than the interaction of the water with the host molecules. The dehydration of the hydrate should thus leave the theophylline network intact, explaining the isomorphic powder X-ray diffractograms of the monohydrate and its dehydrated form III.
Original languageEnglish
Pages (from-to)1395–1401
JournalCrystal Growth and Design
Issue number3
Publication statusPublished - 06 Jan 2012


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